CN102588373A - Engineering machinery and leg hydraulic control device thereof - Google Patents
Engineering machinery and leg hydraulic control device thereof Download PDFInfo
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- CN102588373A CN102588373A CN2012100599678A CN201210059967A CN102588373A CN 102588373 A CN102588373 A CN 102588373A CN 2012100599678 A CN2012100599678 A CN 2012100599678A CN 201210059967 A CN201210059967 A CN 201210059967A CN 102588373 A CN102588373 A CN 102588373A
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Abstract
The invention provides engineering machinery and a leg hydraulic control device thereof. The leg hydraulic control device comprises an oil pump and a plurality of valve groups, wherein an oil inlet of each valve group is connected with an oil outlet of the oil pump; an oil outlet of each valve group is connected with an oil tank; feedback oil ports of each valve group are mutually connected; a valve block comprises a reversing valve, a shuttle valve, a pressure compensation valve, a first external work oil port and a second external work oil port; a pressure oil port of a reversing valve is connected with the oil inlet of each valve group through the pressure compensation valve; a first oil return port and a second oil return port of the reversing valve are connected with the oil outlet of each valve group; and the pressure difference between the pressure oil port of the reversing valve and a first work oil port and/or a second work oil port of the reversing valve keeps constant through the pressure compensation valve. Through the pressure compensation valve arranged in the valve block, the pressure difference between the pressure oil port and the work oil port is in a more stable state, the plurality of valve groups are connected in parallel through the feedback oil ports, therefore, the leg hydraulic control device has the characteristics of simple structure and low cost.
Description
Technical field
The present invention relates to Hydraulic Field, more specifically, relate to a kind of engineering machinery and supporting leg hydraulic control device thereof.
Background technique
In order to improve Security and the stationarity of engineering vehicle (like fire-fighting truck, high empty wagons, hoist etc.) when the operation of band supporting leg, need its supporting leg be launched.When manual working,, should in operator's visual line of sight, carry out the flexible of supporting leg, so that the operator observes the flexible situation of supporting leg at any time for Security and the reliability that guarantees car load.Two supporting legs about car load need use left and right two valve groups to control respectively.When supporting leg is flexible,, need to adopt proportional reversing valve that supporting leg is controlled in order to realize the speed controlling of supporting leg action.
Fig. 1 shows the schematic diagram of supporting leg hydraulic control device of the prior art.As shown in Figure 1, this device comprises valve group 100, oil pump 200 (can be metering pump) and relief valve 400, and relief valve 400 is used for protective system safety.Each valve group 100 comprises a plurality of valve blocks 10; Each valve block 10 comprises selector valve 11; Through sending electromagnetic signal, thereby promote the valve core movement of selector valve, with the openings of sizes of control selector valve 11 to selector valve 11; Reach the big or small purpose of flow of the hydraulic oil of control supporting leg, thus the movement velocity of control supporting leg.Especially, the supporting leg of the left and right sides can move simultaneously, also can single movement.
When load variations, the pressure hydraulic fluid port of selector valve and the pressure difference between the actuator port can change but in the prior art.Under this operating mode, not only receive the influence of the openings of sizes of this selector valve through the flow of selector valve, also receive the influence of this pressure difference, so the proportionality between the size of the flow of selector valve and its opening is bad.In addition, when two or more supporting legs moved simultaneously, because the resistance that each supporting leg receives is different, therefore, the synchronism of each supporting leg was bad.In addition, the selector valve in the valve group of the prior art is automatically controlled, and the pressure and the flow of its control are low.
Summary of the invention
The present invention aims to provide a kind of engineering machinery and supporting leg hydraulic control device thereof, with the pressure hydraulic fluid port of the selector valve that solves existing technology valve group and the pressure difference between the actuator port is unstable, proportionality is bad, and the problem that can not a plurality of valve groups parallel connections be used.
For solving the problems of the technologies described above, according to a first aspect of the invention, a kind of supporting leg hydraulic control device of engineering machinery is provided, comprise oil pump and a plurality of valve group, the valve group comprises filler opening, oil outlet, feedback hydraulic fluid port and valve block; The filler opening of each valve group is connected with the oil outlet of oil pump; The oil outlet of each valve group is connected with fuel tank; The feedback hydraulic fluid port of each valve group interconnects; Valve block comprises selector valve, shuttle valve, pressure-compensated valve, the first operate outside hydraulic fluid port and the second operate outside hydraulic fluid port; Selector valve comprises pressure hydraulic fluid port, first return opening, second return opening, first actuator port and second actuator port; Selector valve comprises by station, the first switching-over station and the second switching-over station; The pressure hydraulic fluid port of selector valve is connected with the filler opening of valve group through pressure-compensated valve; First return opening of selector valve is connected with the oil outlet of second return opening with the valve group; First actuator port of selector valve is connected with the first operate outside hydraulic fluid port of valve block, and second actuator port of selector valve is connected with the second operate outside hydraulic fluid port of valve block; Pressure difference between second actuator port of the pressure hydraulic fluid port of selector valve and first actuator port of selector valve and/or selector valve keeps constant through pressure-compensated valve; The valve group comprises at least two valve blocks that set gradually; The valve group compares first actuator port of each valve block of valve group and/or the return pressure of second actuator port and supporting leg hydraulic control device through the shuttle valve of each valve block, and will be wherein the maximum pressure oil of pressure export to the feedback hydraulic fluid port of valve group through one-way valve.
According to a second aspect of the invention, a kind of engineering machinery is provided, has comprised supporting leg and the supporting leg hydraulic control device that is used to control supporting leg, this supporting leg hydraulic control device is above-mentioned supporting leg hydraulic control device.
The present invention is in than stable status the pressure difference between pressure hydraulic fluid port and the actuator port through the pressure-compensated valve that is arranged in the valve block, and can a plurality of valve group parallel connections be used through its feedback hydraulic fluid port, has characteristics simple in structure, that cost is low.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 has schematically shown the schematic diagram of supporting leg hydraulic control device of the prior art;
Fig. 2 has schematically shown the schematic diagram of the supporting leg hydraulic control device in the first embodiment of the invention; And
Fig. 3 has schematically shown the schematic diagram of the supporting leg hydraulic control device in the second embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As first aspect of the present invention, a kind of supporting leg hydraulic control device of engineering machinery is provided.As shown in Figures 2 and 3, the supporting leg hydraulic control device comprises oil pump 200 and a plurality of valve groups 100.Preferably, oil pump 200 is metering pumps.
This valve group 100 comprises oil inlet P, oil outlet T, feedback hydraulic fluid port LS and valve block 10.The oil inlet P of each valve group 100 is connected with the oil outlet of oil pump 200; The oil outlet T of each valve group 100 is connected with fuel tank 300; The feedback hydraulic fluid port LS of each valve group 100 interconnects.
Valve block 10 comprises selector valve 11, shuttle valve 12, pressure-compensated valve 13, the first operate outside hydraulic fluid port 14 and the second operate outside hydraulic fluid port 15.Selector valve 11 comprises pressure hydraulic fluid port P1, first oil return inlet T 1, second oil return inlet T 2, the first actuator port A and the second actuator port B.Selector valve 11 comprises by station, the first switching-over station and the second switching-over station.The pressure hydraulic fluid port P1 of selector valve 11 is connected with the oil inlet P of valve group 100 through pressure-compensated valve 13; First oil return inlet T 1 of selector valve 11 is connected with the oil outlet T of valve group with second oil return inlet T 2; The first actuator port A of selector valve 11 is connected with the first operate outside hydraulic fluid port 14 of valve block 10, and the second actuator port B of selector valve 11 is connected with the second operate outside hydraulic fluid port 15 of valve block 10.
Pressure difference between first actuator port A of the pressure hydraulic fluid port P1 of selector valve 11 and selector valve 11 and/or the second actuator port B of selector valve 11 keeps constant through pressure-compensated valve 13.Preferably, as shown in Figures 2 and 3, when selector valve 11 switching-overs, the control mouth F of pressure-compensated valve 13 is connected with the first actuator port A of selector valve 11 or the second actuator port B.
Valve group 100 comprises at least two valve blocks that set gradually 10; Valve group 100 compares the first actuator port A of each valve block 12 of valve group 100 and/or the return pressure of the second actuator port B and supporting leg hydraulic control device through the shuttle valve 12 of each valve block 10, and will be wherein the maximum pressure oil of pressure export to the feedback hydraulic fluid port LS of valve group 100 through one-way valve 60.In a preferred embodiment, as shown in Figures 2 and 3, shuttle valve 12 comprises the first filler opening C, the second filler opening D and oil outlet E.When selector valve 11 switching-overs, the first filler opening C of shuttle valve 12 is communicated with the first actuator port A of selector valve 11 or the second actuator port B.In addition, the oil outlet E of the shuttle valve 12 of first valve block 10 is connected with the feedback hydraulic fluid port LS of valve group 100 through one-way valve 60, and the oil outlet E of the shuttle valve 12 of other valve block 10 is connected with the second filler opening D of the shuttle valve 12 of previous valve block 10 successively; The second filler opening D of the shuttle valve 12 of last valve block 10 is connected with the oil outlet T of valve group 100.
Please refer to Fig. 2 and Fig. 3, in the end in valve block 10, shuttle valve 12 compares the first actuator port A of selector valve 11 or the pressure of the second actuator port B and the return pressure of system, and wherein the higher pressure oil of pressure is exported from its oil outlet E.The previous valve block 10 of this last valve block compares the pressure of the pressure oil of the oil outlet E of the shuttle valve 12 of this last valve block 10 output with first actuator port A of the selector valve of himself 11 or the pressure of the second actuator port B, and general's pressure oil that wherein pressure is bigger is exported from its oil outlet E.By that analogy, the shuttle valve with a plurality of valve blocks couples together.For first valve block 10, the pressure at the oil outlet E place of its shuttle valve 12 is exactly the pressure of the actuator port with pressure maximum in a plurality of valve blocks 10 in the whole valve group 100.This pressure feeds back away through the feedback hydraulic fluid port LS of one-way valve 60 by valve group 100.Because the existence of one-way valve 60, can be with to use that be together in parallel of two or more valve groups 100, the pressure oil of feasible feedback hydraulic fluid port LS from a valve group 100 can not influence the proper functioning of other valve group 100.In addition, can a plurality of valve groups 100 be separately positioned on different positions, for example,, can at two side leg places corresponding valve block be set respectively respectively, and realize the single movement of each valve group or action simultaneously for engineering machinery with supporting leg.
Further, the actuator port of each valve block 10 (for example first actuator port or the second actuator port) pressure of locating is fed back to the control mouth F of pressure-compensated valve 13.Therefore, can guarantee that the pressure hydraulic fluid port P1 of selector valve 11 and the pressure difference between the first actuator port A or the second actuator port B are substantially invariable through pressure-compensated valve 13.Like this, improved the proportionality between the size of flow and its opening of selector valve, so that control flows is to the flow of actuator and the speed of control executing mechanism better.
Preferably; Valve group 100 also comprises first relief valve 20; The import of first relief valve 20 is connected with the oil inlet P of valve group 100, and the outlet of first relief valve 20 is connected with the oil outlet T of valve group 100, and the control port of first relief valve 20 is connected with the feedback hydraulic fluid port LS of valve group 100.Like this, can pass through the pressure of the oil inlet P of first relief valve, 20 control valve groups 100, its pressure is associated, with the feedback pressure of the feedback hydraulic fluid port LS of valve group 100 with the better protection system.
Preferably, valve group 100 comprises that also the import of second relief valve, 30, the second relief valves 30 is connected with the feedback hydraulic fluid port LS of valve group 100, and the outlet of second relief valve 30 is connected with the oil outlet T of valve group 100.Like this, can the pressure maximum of the actuator port of valve group 100 be limited and protect through second relief valve 30.
Preferably, valve group 100 comprises that also the import of the 3rd relief valve 40, the three relief valves 40 is connected with the oil inlet P of valve group 100, and the outlet of the outlet of second relief valve 30 and/or the 3rd relief valve 40 is connected with the oil outlet T of valve group 100.The maximum input pressure of valve group 100 can be set through the 3rd relief valve 40.For example, can set the pressure of the 3rd relief valve 40 higher, like this, can constitute the two-stage protection than the pressure of first relief valve 20.
In one embodiment, as shown in Figure 2, the selector valve 11 in each valve block 10 is hand-operated direction valve (particularly manual electric proportional reversing valves).Like this; Just can electromagnetic signal be provided through reversing valve operated Joystick to selector valve; Spool to promote selector valve moves, thereby the openings of sizes of control selector valve offers the flow size of the hydraulic oil of actuator's (like supporting leg) with control, and then controls its movement velocity.
In another embodiment, as shown in Figure 3, the selector valve 11 in each valve block 10 is electro-hydraulic proportion reversing valves, and the control port of each electro-hydraulic proportion reversing valve is connected with the oil inlet P of valve group 100 through reduction valve 50.Through this pressure-compensated valve 13 can control flows to the pressure of the control port of the selector valve of each valve block, guarantee that the pressure of control port place of the selector valve of each valve block equates.Then, can control the aperture of selector valve 11 through the pressure oil of this control port.Owing to adopt this mode,, can control higher pressure and flow with respect to electric proportional reversing valve.
Like this; In Constant Pump System, can adopt the valve group among the present invention, guarantee that the pressure hydraulic fluid port and the pressure difference between the actuator port of the selector valve in the valve group is a definite value; Make the flow of selector valve only receive the big or small influence of its valve port opening, improved the proportionality of selector valve.In addition; Because each valve group all is provided with one-way valve 60; Can the parallel connection of a plurality of valve groups be used, and can prevent monolateral supporting leg action the time, the pressure oil of the feedback hydraulic fluid port of the valve group corresponding with this supporting leg is through the shuttle valve leakage of other valve group; Therefore, can be in Constant Pump System parallel connection use the valve group of a plurality of above-mentioned band pressure compensations.The present invention allows two or more valve components are opened layout, in addition, because the feedback hydraulic fluid port LS of each valve group interconnects, therefore can realize the single movement of valve group or action simultaneously.At last, owing in the valve group, be provided with control oil channel (being embodiment shown in Figure 3), make the valve group can pass through higher pressure and bigger flow.
As second aspect of the present invention, a kind of engineering machinery is provided, comprise supporting leg and the supporting leg hydraulic control device that is used to control supporting leg, this supporting leg hydraulic control device is the supporting leg hydraulic control device among above-mentioned each embodiment.Especially, engineering machinery is fire-fighting truck, concrete mixer or hoist.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the supporting leg hydraulic control device of an engineering machinery comprises oil pump (200) and a plurality of valve group (100), it is characterized in that,
Said valve group comprises filler opening (P), oil outlet (T), feedback hydraulic fluid port (LS) and valve block (10); The filler opening (P) of each said valve group (100) is connected with the oil outlet of said oil pump (200); The oil outlet (T) of each said valve group (100) is connected with fuel tank (300); The feedback hydraulic fluid port (LS) of each said valve group (100) interconnects;
Said valve block (10) comprises selector valve (11), shuttle valve (12), pressure-compensated valve (13), the first operate outside hydraulic fluid port (14) and the second operate outside hydraulic fluid port (15);
Said selector valve (11) comprises pressure hydraulic fluid port (P1), first return opening (T1), second return opening (T2), first actuator port (A) and second actuator port (B); Said selector valve (11) comprises by station, the first switching-over station and the second switching-over station;
The pressure hydraulic fluid port (P1) of said selector valve (11) is connected with the filler opening (P) of said valve group through said pressure-compensated valve (13); First return opening (T1) of said selector valve (11) is connected with the oil outlet (T) of said valve group with second return opening (T2); First actuator port (A) of said selector valve (11) is connected with the first operate outside hydraulic fluid port (14) of said valve block (10), and second actuator port (B) of said selector valve (11) is connected with the second operate outside hydraulic fluid port (15) of said valve block (10);
Pressure difference between second actuator port (B) of the pressure hydraulic fluid port (P1) of said selector valve (11) and first actuator port (A) of said selector valve (11) and/or said selector valve (11) keeps constant through said pressure-compensated valve (13);
Said valve group (100) comprises at least two said valve blocks (10) that set gradually; The shuttle valve (12) of said valve group (100) through each said valve block (10) compares first actuator port (A) of each said valve block (12) of said valve group (100) and/or second actuator port (B) return pressure with said supporting leg hydraulic control device, and wherein the maximum pressure oil of pressure is exported to the feedback hydraulic fluid port (LS) of said valve group (100) through one-way valve (60).
2. supporting leg hydraulic control device according to claim 1 is characterized in that, when said selector valve (11) commutated, the control mouth (F) of said pressure-compensated valve (13) was connected with first actuator port (A) of said selector valve (11) or second actuator port (B);
Said shuttle valve (12) comprises first filler opening (C), second filler opening (D) and oil outlet (E); When said selector valve (11) commutated, first filler opening (C) of said shuttle valve (12) was communicated with first actuator port (A) of said selector valve (11) or second actuator port (B).
3. supporting leg hydraulic control device according to claim 2 is characterized in that,
The oil outlet (E) of the said shuttle valve (12) of first said valve block (10) is connected with the feedback hydraulic fluid port (LS) of said valve group (100) through said one-way valve (60), and the oil outlet (E) of the said shuttle valve (12) of other said valve block (10) is connected with second filler opening (D) of the said shuttle valve (12) of previous said valve block (10) successively;
Second filler opening (D) of the said shuttle valve (12) of last said valve block (10) is connected with the oil outlet (T) of said valve group (100).
4. according to each described supporting leg hydraulic control device among the claim 1-3; It is characterized in that; Said valve group (100) also comprises first relief valve (20); The import of said first relief valve (20) is connected with the filler opening (P) of said valve group (100), and the outlet of said first relief valve (20) is connected with the oil outlet (T) of said valve group (100), and the control port of said first relief valve (20) is connected with the feedback hydraulic fluid port (LS) of said valve group (100).
5. supporting leg hydraulic control device according to claim 4; It is characterized in that; Said valve group (100) also comprises second relief valve (30); The import of said second relief valve (30) is connected with the feedback hydraulic fluid port (LS) of said valve group (100), and the outlet of said second relief valve (30) is connected with the oil outlet (T) of said valve group (100).
6. supporting leg hydraulic control device according to claim 5; It is characterized in that; Said valve group (100) also comprises the 3rd relief valve (40); The import of said the 3rd relief valve (40) is connected with the filler opening (P) of said valve group (100), and the outlet of said second relief valve (30) is connected with the oil outlet (T) of said valve group (100).
7. supporting leg hydraulic control device according to claim 6; It is characterized in that; Selector valve (11) in each said valve block (10) is an electro-hydraulic proportion reversing valve, and the control port of each said electro-hydraulic proportion reversing valve is connected with the filler opening (P) of said valve group through reduction valve (50).
8. supporting leg hydraulic control device according to claim 5 is characterized in that, the selector valve (11) in each said valve block (10) is a hand-operated direction valve.
9. an engineering machinery comprises supporting leg and the supporting leg hydraulic control device that is used to control said supporting leg, it is characterized in that said supporting leg hydraulic control device is each described supporting leg hydraulic control device among the claim 1-8.
10. engineering machinery according to claim 9 is characterized in that, said engineering machinery is fire-fighting truck, concrete mixer or hoist.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102788055A (en) * | 2012-08-07 | 2012-11-21 | 徐工集团工程机械股份有限公司 | Hydraulic system of wrecker |
| CN103807241A (en) * | 2013-11-18 | 2014-05-21 | 浙江大学 | Integrated type filter device for pilot type proportional valve |
| CN104141649A (en) * | 2014-06-30 | 2014-11-12 | 湖南三一路面机械有限公司 | Flow converging valve group, power generating heating hydraulic flow converging control system and spreading machine |
| CN110712735A (en) * | 2019-08-29 | 2020-01-21 | 武汉船用机械有限责任公司 | Hydraulic control system for a water jet propulsion device |
| CN112360833A (en) * | 2020-11-11 | 2021-02-12 | 三一汽车起重机械有限公司 | Flow control system, flow control method and crane |
| CN116164003A (en) * | 2023-03-07 | 2023-05-26 | 浙江大学 | Load port independent control valve for distributed hydraulic system and control method thereof |
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| CN110712735A (en) * | 2019-08-29 | 2020-01-21 | 武汉船用机械有限责任公司 | Hydraulic control system for a water jet propulsion device |
| CN112360833A (en) * | 2020-11-11 | 2021-02-12 | 三一汽车起重机械有限公司 | Flow control system, flow control method and crane |
| CN116164003A (en) * | 2023-03-07 | 2023-05-26 | 浙江大学 | Load port independent control valve for distributed hydraulic system and control method thereof |
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| CN102588373B (en) | 2015-02-18 |
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Address after: 410200 No. 997, Section 2, Tengfei Road, Wangcheng District, Changsha City, Hunan Province Patentee after: Hunan Zoomlion emergency equipment Co., Ltd Address before: 410013 Zhonglian science and Technology Park, No. 361 silver basin South Road, Changsha, Hunan, Yuelu District Patentee before: Changsha Zhonglian fire fighting Machinery Co., Ltd |